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Perfect for keeping postage costs low, these high quality postal boxes are 160x110x20mm allowing them to be sent as a Royal Mail Large Letter. Assembly is fast with pre-creased folding points and an integrated locking tab so these secure, protective postal boxes increase your efficiency as well as reducing your postal costs. Features include: Degradable, recyclable and reusable Supplied flat packed Sized to ensure low postal costs Made from 75% recycled single wall board Simple to assemble White outer and brown inner